Preparation And Photocatalytic Activity Of Bismuth Oxychloride-based Composite Materials

Photocatalytic oxidation technology directly converts solar energy into chemical energy and electrical energy through semiconductor photocatalytic materials,thereby completely mineralizing and decomposing toxic and harmful organic pollutants in the environment.It is considered to be one of the most powerful technical solutions to human energy and environmental problems.For BiOCl semiconductor materials,their unique layered structure,photoelectric properties,and good photocatalytic activity and stability have attracted great attention from scientists in the field of photocatalysis at home and abroad.However,due to the wider band gap of BiOCl semiconductor material,its utilization of visible light is low,which limits its application.In recent years,many scientists and researchers have modified BiOCl semiconductor materials through various approaches and methods to prepare photocatalysts with visible light response range.In this work,BiOCl was prepared by grinding method first,and then calcined at different temperatures,and the performance of the calcined catalyst was compared with BiOCl prepared at room temperature.Afterwards,the method of hydrothermal synthesis was used to compound BiOBr and ZnO with BiOCl,and two composite photocatalysts,BiOBr/BiOCl and ZnO/BiOCl,were successfully prepared.XRD,SEM,EDS,UV-Vis,PL and other methods were used to characterize the crystal structure,morphology,element composition and band gap of the catalyst.The results show that the synthesized materials are indeed BiOCl and BiOBr/BiOCl and ZnO/BiOCl composite photocatalysts,and the lattice structure of BiOCl is not changed after recombination.Afterwards,the BiOCl,BiOBr/BiOCl and ZnO/BiOCl photocatalysts were tested for activity.The photocatalytic activity of the prepared catalysts was tested by degrading Rhodamine B and using the concentration change of Rhodamine B as the test index.The experimental results show that the photocatalytic activity of BiOBr/BiOCl and ZnO/BiOCl composite photocatalysts is higher than that of a single BiOCl,and the degradation rate can reach more than 90%.All of them conform to the first-order reaction kinetics and the kinetics is simulated.The linear correlation of the combination is very high.In summary,the composite modification method of BiOCl can indeed improve the photocatalytic activity of bismuth oxychloride,and play an effective role in the degradation of rhodamine B organic pollutants.The above results are for further exploration of BiOCl-based composite photocatalysts.It provides a test basis for the degradation of organic pollutants in wastewater.